From: Lu Baolu <baolu...@linux.intel.com>
[ Upstream commit 5bb71fc790a88d063507dc5d445ab8b14e845591 ]
The spec states in 10.4.16 that the Protected Memory Enable
Register should be treated as read-only for implementations
not supporting protected memory regions (PLMR and PHMR fields
reported as Clear in the Capability register).
Cc: Jacob Pan <jacob.jun....@linux.intel.com>
Cc: mark gross <mgr...@intel.com>
Suggested-by: Ashok Raj <ashok....@intel.com>
Fixes: f8bab73515ca5 ("intel-iommu: PMEN support")
Signed-off-by: Lu Baolu <baolu...@linux.intel.com>
Signed-off-by: Joerg Roedel <jroe...@suse.de>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
drivers/iommu/intel-iommu.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 2068cb59f7ed..b1966269f26a 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -1402,6 +1402,9 @@ static void iommu_disable_protect_mem_regions(struct
intel_iommu *iommu)
u32 pmen;
unsigned long flags;
+ if (!cap_plmr(iommu->cap) && !cap_phmr(iommu->cap))
+ return;
+
raw_spin_lock_irqsave(&iommu->register_lock, flags);
pmen = readl(iommu->reg + DMAR_PMEN_REG);
pmen &= ~DMA_PMEN_EPM;
--
2.19.1
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